Operating mechanism.



H. S. HART L F. SEABERG. OPERATING MECHANISM.

APPLICATION FILED FEB-Z3, 1910.

Patented Dec. 29, 1914.

4 SHEETS-SHEET 1.

0 O 00 D o 0 o 0 O 0 0 U O O O OO 9 0 o o0 o o-o- 'n n O 0 H. ls. HARM; F. SEABERG.

OPERATING MECHANISM. APPLICATION FILED FBB.23, 1910.

Patented DeC. 29, 1914.

4 SHEETS-SHEET 2.

H. S. HART & I'. SEABERG.

OPERATING MBGHANISM. APPLICATION FILED PEB.23, 1910.

Patented 1m29, 1914.

4 SHEETS-SHEET 3.

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@MLM-@563,3 l. fi,

H.'S. HART & 1:". SEABERG.

OPERATING MECHANISM. APPLICATION IILED 1113.23, 1910.

Patented Dec. 29, 1914.

ITED .STATES IDA-Pi1 HARRY s. HART AND FREDERICK sEARERc, OE CHICAGO, ILLINOIS, AssIeNoRs 'ro NATIONAL DUMP CAR COMPANY, OECIIICAGO, ILLINOIS, A CORPORATION or MAINE.

OPERATING MECHANISM.

speciacation of Letters ratnt. Patmted @ma 2g, 19ML Application led February 23, 1910. Serial No. 545,474.

To all whom 'it may Concern Be it known that we, HARRY S. HART and FREDERICK SEABERG, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois. have invented certain new and useful Improvements in Operating Mechanism, of which the following is a specification.

Our invention relates to dump cars in which the bottom of a car is divided into the mechanism for operating the dump doors. While particularly designed for hopper cars our invention is applicable to other forms of dump cars.

The objects and advantages of our improvements will become more fully apparent in the following specification andl claims, taken in connection with the accompanying drawings, in which- Figure 1 is a side view of the car with our improvements applied thereto. Fig. 2 is a cross section of the lower portion of the car, taken substantially on the line 2-2 of Fig. 1 and showing the greater part of our improvements. Fig. 3 is a horizontal section of the car, taken substantially along the line 3 3 of Fig. 2 and showing the greater part of our improvements in plan or top View. Fig. L1 is a longitudinal section of the lower portion of the car, taken substantially along the line 4-41 of Fig. v

Similar reference nimerals designate the same parts in different views.

In the drawings the body 10 of the car has a form known as a hopper car body and is provided with vertical side walls 11 and .sloping end walls 13. The sloping plates-12 are attached at their upper edges to the vertical side walls 11 and terminate in their lower portions in vertical walls 15, which latter serve as vertical side walls of a rectangular discharge opening in the bottom of the car. The sloping end walls 13 also termi nate invertical portions 14, which, in a similar manner to the walls 15, serve as end walls for the said rectangular central discharge opening.

The rectangular central discharge opening 1s preferably given a form in which its longer dimensions are parallel to the longitudinal dimensions ofthe car. The rectangular discharge opening is divi-ded into two sections by transverse walls 16, made of steel plates, which have sloping and converging upper portions '17 terminating in flanges 18, which are riveted together. These plates 16 are riveted at their ends to the vertical walls 15 of the central discharge opening. The plates 16, because of the particular form given to them, provide a convenient housing or cover for the principal parts of the dump door operating mechanism, which comprises chiefly the subject of our invention. This housing, as will be seen in the drawings-particularly in Figs 2 and 4- does not extend upwardly further than the vertical side walls 15 of the central discharge opening. It will be seen that the main body of the car is free of partitions. The housing referred to is confined wholly to the portion of the car which is immediately adjacent the discharge opening, and divides the said discharge opening into two parts. The plates 16 are secured at their ends to the side walls 15 by the angle bars 19 and suitable rivets.

The eXtreme lower edges of the walls 14 at the bottom of the sloping end plates 13 are provided with inwardly turned horizon- -tal flanges 20. The lower edges of the plates 16 are also provided with similar inwardly turned horizontal flanges 20a. These flanges 20 and 2Oa serve as abutments against which the edges of the door 21 bear when closed.

The side walls 15 terminate at their lowerare secured to the side walls 11 at their lower edges. Between the channel bars 22 and the angle bars 23 are placed struts or stays 24,

-whichare secured at their ends to the channel bars 22 and angle bars 23. These struts or stays 24, are. convenient for the attachment of the tracks 29, which will be de- 5 scribed later.

The dump doors 21 are provided with Z- bars 25 secured to their lower faces, which serve as stiffening ribs for sai doors.Y The lowermost anges of the said Z-bars also provide bearing surfaces by which the dump door is supported upon the movable doorsupporting shaft 27 and the fixed door-supporting shaft or bar 26. It will ybe seen that when the doors are in a closed position-and such a condition is shown in the drawings in f ull lines-they are supported at their outer edges by the fixed bar 26 and near their inner edges by the movable door-supporting shaft 27 The movable door-supporting shaft 27 rests upon track bars 28, of which there are ltwo for each door. These track bars 28, however, extend transversely of the car for a distance extending entirely beneath and beyond the discharge opening and are fixed to the car frame at their ends 29. The ends 29 are riveted to the struts or stays 24. It will be seen that there are two doors 21 and 21a which are supported by two track 30L bars 28. The doors 21 and 21L are arranged in pairs, having their meeting edges lying in the central vertical plane of the car and their opposite or outer edges disposed be; neath the side walls 15 of the central discharge opening or chute. One pair of doors thereof serve to close the bottom of onehalf, or one of the divisions of the central discharge openings. It will be understood that the divisions above referred to extend from the'plates 416 to the vertical portions n14-of the end walls 13.

The fixed door-supportingshaft--26 lis lheld in position by the -bearing 30, which is -r-iveted'to theftrack bar 28 by the rivets 31.

The bearing 30 may be made of a piece of fsteel plate. Themiddleportions of the lvtrack bars 28 maybe lsupported from the plates 16 of the car frame by the -plates 32, which are riveted at 33 to. the said plates16 ,50 and at 34 to'the said track bars l28. The

shafts 27, 27 are' held by parts rigidly attached to` the car' frame and no tendency -to slide` from their normal -position exists. fr vThe dump. doors 2l -and 2la are provided withvdownwardlyprojecting hooks or lugs 35, which are riveted to thewebs of. the Z-bars 25 and vserve to limit the inward 'movement of said doors. The inward movement of the said dump doors is limited by v fcontact of the said hooks or lugs 35 with the 'fixed supporting bar 26 `The lsaid downlwardly projecting hooks or lugs 35, taken -in connection with the fixed supporting bar 26, serve in a great measure as a hinge for 6' the dump doors 21'and 21, though they leave the said fixed supporting bar when the downward movement of the dump door begins. The movable door-supporting shaft 27 is provided with sleeves 36, forming part of a gear 45 described later, said sleeves 7o bearing upon the track bars 28. The movable door-supporting shaft 27 is provided with a drum or barrel 37, by which rotary movement is imparted to said shaft by the flexible memberor chain 38. This flexible member or chain is attached at its ends to a spiral conical sheave 39, which is adapted to wind up one end portion of said chain and to unwind the other end portion of said chain when it is rotated. The sheave 39 80 is fixed to and mounted upon an operating shaft 40, arranged transversely of the car and provided with suitable bearings in the car frame. f

The operating shaft 40 is preferably 85 placed a suitable distance above the movable door-supporting shafts 27. This operating shaft is extended a sufiicient distance beyond the outer wall of the car body upon each side, to permit the attachment of an operating crank or other driving means. In the drawings we have shown the ends squared at 41 to receive the hub of an ordinary hand crank. v v One'end of the flexible chain or member 95 38 is attached to the sheave 39 in the bottom of a spherical groove 44 on said sheave, by a pin 42. The other end of said chain 38 is fixed to the larger end of said conical sheave by the pin 43, in a similar manner. It will be seen that when the shaft 40 is rotated, one end of the chain 38 will be wound upon one end of the conical sheave 39, while the other end of the chain is unwound from the other end of the conical sheave. When thus operated it will be seen that the intermediate portion of the chain 38 which is not wound upon the sheave 39 will have-a Variable length. This is due to the fact that one end of the chain is taken up more rapidly or more slowly than Lthel other by the conical sheave 39.

The chain 38 is given two or more turns about the drum 37 and should be held against slipping on said drum by a pin 38, which may be passed through a link. If preferred, two separate chains leading from a pin 38 to the pins 42 and 43 may be used. The advantage of the variation in length of the intermediate portion of the chain 38 will soon become apparent.

Upon the movable door-supporting shafts 27 are fixed toothed wheels or gear pinions 45, which mesh with pins or teeth 46 upon the track bars 28. These track bars are provided with a downwardly and outwardly curved vportion 47, which permits a downward movement of the door-supporting shaft 27 when it is moved along said track. It will be seen that when the operating shaft 40 is rotated, a rotary motionwill be imparted to the. doorfsupporting shaft 27, and, because of the gear abovel described, an outward movement -of said shaft will take place. At the same time a downward movement will occur, and this'downward movement will be permitted and accommodated by the increase in lengthof the intermediate portion of the chain 38. The downwardly and outwardly curved portion 47 of the track is given such degree of curvature as will accommodate the increase of length of the intermediate portion of the chain 38.

The downward and outward movement is limited by the sharp 'curve or bend 48 in y the track 28, and the track bar at this point is extended upwardly, being finally riveted at 29 to the frame ofthe car.

The dump doors 21, 21a are provided with a downwardly projecting bearing 49 for the supporting vshafts 27, and the aperture 50 in this bearing is elongated or given a slotted form to permit an initial movement of the shaft 27 before the door itself is 1 moved from its normal position. This initial movement 1sv suiiiclent to permit the shaft 27 to leave the horizontal portion of the bar 28 and to begin the downward movement upon the.curved portion 47. It will be seen that while the shaft 27 is resting upon the horizontal portion of the track bar 28 it has no tendency to move from that position. It may, however, be easily moved by the operator from its normal position to the curved part of the track without moving the heavily weighted door 2l. After the shaft 27 has reached the curved part 47 of the track, the load resting upon the door assists in opening it.

The downwardly and outwardly curved portion 47 of the track bar is given such a curvature as will cause the movable doorsupporting shaft 27 to approach in ameasure the fixed shaft 26. The bearing 49 will cause the shaft 27 to transmit its movement to the door and give itan outward and upward movement upon the fixed shaft 26.

This outward and upward movement is accompanied by an angular movement of the door. This particular movement results in a wide opening of the doors and causes them to assume positions which have a steep slope and at the same time effects the opening of the doors with a minimum downward movement thereof. This latter feature renders it possible to carry the central hopper down close to the track.. This is clearly shown by ihe dotted line position of the doors Vin The shaft 40 may be provided at each of its outer ends with a ratchet-device A51 for Istarting the -shaft and which is operated by the usual hand crank or lever as is common in dump car mechanism.

The operation of our improved dump door-operating mechanism has been largely referred to in the foregoing description. In using this mechanism the operator may place a crank upon the squared end 4l of the operating shaft 40 and give the said shaft a rotary movement in such direction as will cause the end of the chain which is attached to the pin 41 to wind upon the smaller end of the conical sheave 39. This rotary movement will cause that portion of the chain which is wound upon the larger end of the sheave 39 to unwind. The chain 38 will therefore impart a rotary motion to the drum or barrel 37, and hence the doorsupporting shaft will be rotated. The ro, tation of the shaft`27 will be in such a direction as to cause it to move outwardly upon the track bar 28. This will be effected by means of the engagement of the gea-r teeth 45 with the gear teeth or pins 46. The outward movement of the shaft means, cause a continued rotary motion of the shaft 27 to take place, and the said shaft will move upon the downwardly and outwardly curved part 47 of the track. The shaft 27 will cause the door 21 to move outwardly. The weight of the load upon the door 21 will cause it to move downwardly. These combined forces will cause the weight of the door and the load upon it to be carried by the curved portion 47 of the track. The increased length of the intermediate portion of the chain 38 will permit this downward movement. This downward and outward movement will continue until the shaft 27 reaches the bend 48 inv the track bar, when the movement will be arrested.

During the above described operation, the outer portion of the door will slide upon the fixed supporting bar 26, and because of the relative position of the parts the outer most edge of the door will rise to a position between the frame bars 22 and 23.

To close the doors, the operator gives an opposite rotary movement to the shaft 40. The conical spiral sheave 39 will cause one `end of the chain 38 to be wound up `more shafts 27 rest upon the horizontal portion of the track 2S and until the meeting edges of the doors have come in Contact.

' With our improved form of door-operating mechanism, as above described, both doors can be operated from either side of the car. By our improved construction also the advantages of bodily sliding and shaft-supported doors that can be simultaneously op erated from either side of the door are attained. A The advantages of bodily sliding doors that can be thus operated are very great, as by this means a wide opening of the discharge opening can be quickly effected in-the minimum space between the car body and the track.' By this means a car of greater capacity can be produced by utilizing a great part of the space immediately above the track.

'Vith our improved construction we are enabled to attain the advantages of shaftsupporteddoors which are rigidly and eiliciently held by parts which are directly at- /tached to tlie car frame,-and in which no Y y ated.

tendency exists to L displace the doors because of the great weight of the load.

While we have described more or less precisely the details of construction, we do not wish to be understood as limiting ourselvesl thereto, as we contemplate changes in form and proportion of parts and the substitution of equivalents, as circumstances may suggest or render expedient, without departing from the spirit of our invention.

l/Ve claim l. In a dump car, a spiral sheave suitably supported in the frame of the car and adapted to be rotated, a movable door-supporting shaft, a flexible member adapted to wind upon said sheave at one of its end f portions while unwinding therefrom at the otherv of its end portions, and means fixed to Said door-supporting shaft and engaged by the intermediate portion of said flexible member, whereby said shaft may be oper- 2. In a dumpi car, a ,-spiral sheave suitably supported in the frame of the car and adapted to be rotated, a movable door-supporting shaft, a flexible member adapted to wind upon said sheave at one of its end portions while unwinding therefrom at the other of its end portions, and a drum fixed to said shaft and adapted to engage the intermediate portion of said flexible member, whereby said shaft may be operated.

In a dumpcar, a spiral sheave suitably supported in the frame of the car and adaptedto be rotated, a movable door-supf porting shaft, a flexible member adapted' to wind upon said sheave at one of its end portions while unwinding therefrom at the l,

other of its end portions, a drum fixed to said shaft and adapted to engage the interwhereby said shaft may be operated, a track for supporting and guiding said shaft, and means whereby the rotation of said shaft will cause a bodily movement of said shaft along said track.

5. In a dump car, an operating shaft, a flexible member adapted to wind at one of its end portions; -around said shaft while unwinding at its other end portion from said shaft, and a movable door-supporting shaft angularly disposed to said, operating shaft and about which the intermediate portion of saidexible member is wound and to which it imparts motion, said movable door-supporting shaft being adapted to move bodily 1n a general direction parallel to said op erating shaft while said flexible member is being wound or unwound from said operating shaft.

6. Ina dump car, a door supporting shaft, 4

an operating shaft, a sheave thereon-having portions of different diameters, one of said portions being adapted to receive and wind one of the end portions of a flexible member while the other end portion of said flexible member is unwinding from the other portion of said sheave, whereby the intermediate portion of said member lwill have a variable length, a flexible member adapted to wind upon said sheave as described, and means whereby said intermediate portion of said flexible member may operate said movable door-supporting shaft.

7. In a. dump car, an operating shaft, a sheave thereon having portions of dierent diameters, one of said portionsy being adapted to receive and wind one of the end portions of a flexible member while the other end porti'on of said flexible member is unwinding from the other portionof said sheave, whereby the intermediate portion of said member will have a variable length, a flexible member adapted to wind upon said sheave as described, a movable door-supporting shaft adapted to be engaged by said intermediate portion of said flexible member sheave thereon having portions of different diameters, one of said portions being adapted to receive and wind one of the end portions of a flexible member while the other end portion of saidflexible member is unwinding from the other portion of said sheave, whereby the intermediate portion of said member will have a variable length, a flexible member adapted to wind upon said sheave as described, a movable door-supporting shaft adapted to be engaged by said intermediate portion of said flexible member and to be rotated thereby, a track adapted to support and guide said door-supporting shaft and having a curved portion receding from said sheave, whereby the intermediate portion of said flexible member is kept taut and said door-supporting shaft is guided in a direction which permits the door to open, and means by which the rotation of said door-supporting shaft will cause it to move upon said track.

9. In a dump car, a sheave having lparts of different diameters, one of said parts being adaptedv to receive and wind up one portion of a flexible member while another portion of said exible member is unwinding from the other part of said sheave, whereby the intermediate portion of said member will have a variable length, a flexible member adapted to wind upon said sheave as described, and means engaged by said flexible member for operating a dump door.

10. In a dump car, a conical sheave, a flexible member adapted to wind upon one portion of said sheave while it is unwinding from another portion, and means engaged by said flexible member for Voperating a dump door.

11. In a dump car, a sheave, a flexible member adapted to wind upon one portion of said sheave while it is unwinding from another portion, and a door supporting shaft engaged by said flexible member for operating a dump door. j

12. In a dump car, a conical sheave having a spiral groove, a ilexible member adapted to wind upon one portion of said sheave while it is unwinding from another portion, and means engaged by said flexible member for operating a dump door:

13. In a dump car, a conical sheave having a spiral groove, a flexible member` adapted to wind upon one portionl of said sheave while it is unwinding from another portion, said flexible member being attached at its ends to said sheave, and means engaged by said flexible member for operating a dump door.

14. In a dump car, a conical sheave having a spiral groove, a flexible member hav-r ing its end portions .adapted to wind upon different portions of said sheave, whereby the intermediate unwound portion will vary in length as the sheave is rotated, and means engaged by said intermediate portion of said member for operating a dump door.

15. In av dump car, a bodily movable dump door, a fixed support adjacent and approximately parallel to one side of said door, said door being mounted to freely slide on said support, and a bodily movable supporting and operating bar located adja cent the opposite lside of said door.

16. In a dump car, a bodily movable dump door, a fixed support adjacent and approximately parallel to one side of said door, said door being mounted to freely slide onsaid support, and a bodily movable supporting andV operating bar adjacent the opposite side of said door, said movable supporting bar being arranged to effect movement of said door upon said fixed support.

17. In a dump car, a bodily movable dump door, a fixed supporting member located adjacent and approximately parallel to one side of said door, said door being mounted to freely slide on ,said member, and a bodily movable supporting and operating bar located adjacent the opposite side of said door, said movable supporting bar being arranged to effect movement of said door upon its xed support.

18. In a dump car, a bodily movable dump door, a fixed support adjacent one edge of said door on which said door is free to slide, a movable supporting bar adjacent the opposite edge of said door and having a bearing attached to said door, said bearing being adapted to permit a limited sliding movement of said bar without moving said door and said movable supporting bar be. ing adapted to cause a movement of said door upon its fixed support when moved beyond the limits of said bearing.

19. In a dump car, a bodily and angularly movable dump door, a movable supporting and operating shaft for said door, and means operable from either side of the car for moving said shaft, said means comprising a shaft operatively connected to said operating shaft.

20. In a dump car, a bodily and angularly movable dump door, a movable supporting and operating shaft for said door, and a fixed supporting shaft for said door, said shafts being approximately parallel.

21. In a dump car, ai bodily movable dump door, a bodily movable supporting and operating shaft for said door, and a fixed supporting bar upon which said door is slidably mounted, said shaft and bar being located transversely to the direction of travel of said door. I

22. In a dump car, a bodily movable dump door, a bodily movable operating shaft to which said door is pivoted, and a fixed support upon which said door is adapted to slide, saidshaftand support being approximately parallel.

23. In a dump car, a bodily movable dump door, a movable operating shaft to which said door is pivoted, a fixed support upon which said door is adapted to slide, and means for causing said movable shaft to actuate said door, said means being operable from either side of said car.

24:. In a dump car, a bodily movable dump door, a movable support to which said door is pivoted, a fixed support upon which said door is adapted to slide, means for causing said movable support to actuate said door, and a track for said movable support.

25. In a dump' car, a bodily movable dump door, a movable support to which said door is pivoted, a fixed support upon which said door is adapted to slide, means for causing said movable support to actuate said door, and a track for said` movable' support, said track having a direction which leads away from the plane of the door when said door is in its closed position, whereby said door is given an angular movement about said fixed support.

26. In a dump car, a dump door having a combined sliding and angular movement, and a Xed supporting shaft upon which said door slides and which is disposed transversely with respect to said sliding movement.

427. In a dump car, a dum door having a combined sliding and angu ar movement, and a fixed supporting shaft upon which said door slides and about which it has said angular movement.

28. In a dump car, a spiral sheave, a Iflexible member wound thereon having an 'unwound portion separated from the sheave between the wound portions, and a door 'supporting shaft engaged by said separated portion for operating a dump door.

29. In a dump car, a spiral sheave, a iexible member adapted to wind at different portions of its length upon said sheave with an unwound portion between, and a door supporting shaft engaged by said unvound portion for operating the dump oor.

30. In av dump car, a conical sheave, a iexible member adapted to wind at differentportions of its length upon" said 'sheave with an unwound portion between, andI means engaged by said unwound portion for operating a door-supporting member in directions approaching and receding from said sheave.

31. A car having a bottom comprising doors, said doors having a bodily sliding movement in opening, vshafts pivotally attached to said doors for supporting said doors in their closed positions, and means for displacing said shafts to permit the doors for supporting said doors in their' closed positions, and means for simultaneously displacing said shafts to permit the doors to open, said means being adapted to be operated from either side of the car.

34. A car having a bottom comprising doors, said doors having a bodily sliding movement in opening, shafts pi votally attachedto said doors fory supporting said doors in their closed positions, and means for simultaneously displacing said shafts to permit the doors to open, said means being adapted to be operated from either side of the car.

35. A car having a bottom, comprising doors, said doors having a bodily sliding and angular movement in opening, shafts pivotally attached to said doors for supporting said doors in their closed positions, and means for simultaneously displacing said shafts topermit the doors to. open, said means being adapted to be operated from either side of the car.

36. A car having a bottom comprising` doors, said doors having a bodily lsliding and angular movement in opening and bemg arranged in series oppositely disposed with respect to the center line ofthe car, shafts pivotally attached to said doors for supporting said doors in their closed positions, and means for simultaneously disclosed positions, and fixed supports` for said ldoors near their outer edges and about whlch said doors have said sliding and angular movement.

38. A car having a bottom comprising doors, saidI doors having adjacent edges when in their closed positions, shafts plvotally attachedto said doors for supporting said adjacent edges in their closed positions,I Y

I doors, said doors having adjacent edges when in their closedpositions7 shafts pivotally attached to said doors for supporting said adjacent edges in their closed positions, a track bar for supporting and guiding said shafts, and a frame member in the bottom of the car to which that part of the `track adjacent the supporting positions of the shafts is firmly fixed.

40. A carhaving a bottom comprising doors, a shaft for supporting said doors in 4their closed positions, a track bar for supporting and guiding said shaft, a frame member in the bottom of the car to which that part of the track adjacent the supporting position of said shaft in which the doors are closed is rmly fixed, and a fixed support for the outer edge of said door attached to said track.

41. A car having a bottom comprising doors, a shaft for supporting said doors in their closed positions, a track bar for supporting and guiding said shaft, said track being attached firmly to the car frame at a point inmediately adjacent the supporting position of said shaft in which the doors are closed, and a fixed support for the outer edge of said door attached to said track.

42. A car having a bottom comprising doors, said doors having adjacent edges when in their closed positions, shafts for supporting said adjacent edges in their closed'positions, a track bar for supporting and guiding said shafts, said track being attached firmly to the car frame at a point immediately adjacent the supporting positions of said shafts, said track having a downwardly and outwardly inclined portion leading from the supporting. portion, and an end portion fixed to said car frame.

43. Inl a dump car, a door, a fixed shaft upon which said door is slidably and r0- tatably supported adjacent one edge, a movable supporting member engaging said door adjacent its opposite edge, the movement of l said supporting member permitting said door to rotate upon said fixed shaftv and causing said door to slidebodily upon said shaft.

44. In a dump car, a movable door supporting shaft, a fixed support for a door, and a bodily movable dump door having a limited movable engagement with said door supporting shaft, said movable shaft being adapted to move said door over said fixed support.

45. In a dump car, a movable door supporting shaft, a fixed support for a door, a bodily movable dump door having a limited movable engagement with said movable shaft, means having a limited engagement with said shaft for supporting said shaft in a position which holds said door closed, the extent of said engagement being less than that of the movable engagement of said door with said shaft, and means for displacing said shaft to permit the door to open. y

46. In a dump car, the combination with a bodily movable dump door, of a movable door supporting member engaging such door to have limited transverse bodily movement relatively thereto, for the purpose set forth.

47 In a dump car, in combination, a bodily movable door, a rolling member connected to the door to cause the latter to move bodily therewith, means for rotating such member, and means whereby rotation of the member imparts rolling motion thereto.

48. In a dump car, the combination with a pair of bodily movable doors adapted to close toward one another, of a pair of sheaves, means operatively connecting the sheaves to respective doors, including a pair of flexible members adapted to wind upon thesheaves, and an operating shaft upon which said sheaves are both mounted, such shaft having its axis parallel to a plane extending vertically of the doors in the direction of movement thereof.

49. In a dump car, the combination with a pair of bodily movable doors, of a pair of sheaves, flexible members operatively connected to the doors and to the sheaves, and means for operating such sheaves in unison.

In testimony whereof, we have subscribed our names.

HARRY S. HART. FREDERICK SEABERG. Witnesses:

M. E. STOUTENBURGH, W. J.RYAN. 

